Purpose: This paper investigates the determinants and constraints of competitiveness in Malaysia's brackish water fishery industry. Design/Methodology: The self-administered questionnaires were distributed randomly to 20 brackish water fish farmers in Malaysia. The questionnaire was designed based on the previous studies focusing on Porter's diamond model theory for the determinant of competitive advantage to capture the constraints and determinants influencing competitiveness success. Using the Google Form, the questionnaires were distributed randomly to the brackish water fish farmers.